THERMOELECTRIC-POWER OF SRCE0.95Y0.05O3-DELTA

Thermoelectric power and electrical conductivity of SrCe0.95Y0.05O3-de lta have been determined in a range of atmospheres and temperatures. T he thermoelectric power is negative in reducing and positive in oxidiz ing atmospheres. The data indicate a transition at about 800-1000 degr ees C at oxygen partial pressure approximate to 10(-5) atm between reg imes with different type of main charge carrier. Low oxygen partial pr essure data do not indicate any conductivity contribution from n-type electronic carriers. The water vapour partial pressure dependence is f ound to be in accordance with theory and shows that these experiments can be used to detect proton conductivity.